Resistance spot welding of metal, particularly aluminum

Details Resistance spot welding of metal, particularly aluminum Resistance spot welding of metal, particularly aluminum

1994-06-09

1995-09-12

Reynolds, Bruce A.

Electric heating

Metal heating

For bonding with pressure

219 861, 219 912, B23K 1110, B23K 1136

Patent

active

054498783

ABSTRACT:
A method and apparatus for resistance spot welding aluminum comprises polishing the electrode tips periodically after a number of welds. During the spot welding, a coating or dust builds up on the electrode tips and this has been generally assumed to be pure aluminum. However, it has been found that the coating or dust is aluminum oxide which is nonconductive. Consequently, when power is applied to the electrodes there is a slight spitting or explusion at the electrode tips which are in contact with the aluminum surfaces. The electrodes thus become pitted or arced out after a few welds. To overcome this problem, the electrode tips are polished intermittently after a predetermined number of welds. This can be accomplished by a polishing wheel which is moved between the electrodes when they are in an open position. The polishing wheel preferably is moved against one of the electrode tips for a short period of time and then against the other electrode tip for a similar period, after which the polishing wheel is retracted.

REFERENCES:
patent: 3015713 (1962-01-01), Eckler
Sparagen & Claussen, "Resistance Welding Aluminum", Supplement to Journal of the American Welding Soc., Jul. 1940, pp. 250-255.

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